Year	Percent
1950	29.6797
1955	29.03107
1960	28.93563
1965	29.61494
1970	31.09043
1975	30.9234
1980	30.9841
1985	31.85931
1990	32.24872
1995	32.04692
2000	29.87733
2005	28.31514
2010	27.03852
2015	27.37701
2020	26.53613
2025	24.7918
2030	23.39718
2035	22.65867
2040	22.68602
2045	23.00039
2050	23.18431
2055	22.99699
2060	22.55349
2065	22.19261
2070	22.06001
2075	22.13138
2080	22.23326
2085	22.17661
2090	21.90871
2095	21.53726
2100	21.20523